fix: wrong value for total amount in payments

(cherry picked from commit bf88b8eb65)

erpnext/accounts/doctype/pos_invoice/pos_invoice.py

@@ -441,6 +441,7 @@ class POSInvoice(SalesInvoice):
 
 		if self.is_return:
 			invoice_total = self.rounded_total or self.grand_total
+			total_amount_in_payments = flt(total_amount_in_payments, self.precision("grand_total"))
 			if total_amount_in_payments and total_amount_in_payments < invoice_total:
 				frappe.throw(_("Total payments amount can't be greater than {}").format(-invoice_total))